I don't like the rectangular supporting structure in the diagrams. Little strength against the side force of the wind: The side beams are loaded in bending and the ground anchors in torsion. The force concentrates at the corners and becomes enormous, leading to a tendency for the corners to break and act as hinges, the structure to collapse into a parallelogram, and the blades to hit the ground at speed (after complexifying the collapse by gyroscopic action).
It would be fine with an angled reenforcement from the corners to the ground or from top corners to different bottom corners. But that would either increase the footprint or put guys or other structural members across the wind approaching and leaving the turbine. (Guys wouldn't be much problem for wind interference but might be noisy.)
I notice that on the prototype they extended the axis and used guy wires from the top.
Other than that it looks fine.
